"Red Hat and IBM recently announced that Red Hat Enterprise Linux 5 has earned the highest level of security certification achievable by commercial off-the-shelf operating systems. The certification is applicable when RHEL5 is running on IBM hardware, but all of the software is freely available, which may reduce the worries of customers regardless of which hardware they are considering running Linux on. The Fedora and CentOS distributions will immediately benefit, because they use the same software and SELinux policies, but other distributions can use the information as well."